(1) Copy the files located int he {install}\RPCL folder to
your RADPHP installation folder. Keep all subfolders
intact.
(2) Make sure the PHP connector for NexusDB (or the trial)
is installed correctly. Mainly make sure
(2.1) the nexusdb.dll library is accessible somewhere
in the system path
(2.2) the PHP5 php_nexus.dll is in your Ext folder; for
RADPHP typicalle the {RADPHP}\PHP\EXT folder
(2.3) the PHP.INI enables the php_nexus.dll extension;
in RADPHP this is usually done by adding the line

extension=php_nexus.dll

to the PHP.INI.TEMPLATE in the {RADPHP}\PHP folder
(3) Install the NexusDB package by choosing Component/Install
Package. Navigate to the {RADPHP}\RPCL\Packages folder
and select nexusdbl.package.php file.

You should now have the components in a NexusDB of the
component library/palette.